Anvil for stapling machines



Feb. 9, 1943. E. KRANTz. 2,310,530

ANVIL FOR STAPLING MACHNES Filed June 12, 1941 Patented Feb. 9, 1943 ANVIL FOR STAPLING MACHINES Edward Krantz, deceased, late of Chicago, Ill., by

Helen Krantz, administratrix, Chicago, Ill., assignor of one-half to Henry A. Torstenson and one-half to Valentine Pearson, both of Chicago,

Ill.

`arredi? Fries Application June 12, 1941, Serial No. 397,790

3 Claims. (Cl. 1-3) This invention has to do with stapling machines of the type capable of producing eitherv permanent staples, in which both legs of the staple are clinched toward each other or temporary staples, in which both legs are bent in the same direction.

The object of the invention is to provide in such a stapling machine an improved anvil structure for producing either permanent or temporary staples, which anvil structure is of such character as to permit a portion of the same to be xedly mounted on the base of the machine and used both in the formation of the perma` nent staples and in the formation of the temporary staples.

While the foregoing statements are indicative in a, general way of the nature of the invention, other more specific objects and advantages will be apparent to those skilled in the art upon a full understanding of the improved anvil structure and the manner in which the same is employed.

One embodiment of the invention is presented herein by way of exemplication, but it will of course be appreciated that the invention is susceptible of embodiment in other structurally modified forms coming equally within the scope of the appended claims.

In the vaccompanying drawing:

Fig. 1 is a side View of a stapling machine equipped with the improved anvil structure of the invention;

Fig. 2 is a plan view of the front end of the base of the machine, showing the anvil set to produce a permanent staple;

Fig. 3 is a similar view, showing the anvil set to produce a temporary staple;

Fig. 4 is a vertical longitudinal section through the front end of the base of the machine, taken on the line 4-4 of Fig. 2;

Fig. 5 is a side View of one of the permanent staples produced with the machine; and

Fig. 6 is a side view of one of the temporary staples produced with the machine.

The stapling machine shown in the drawing is substantially the same as that disclosed in Krantz Patent No. 2,154,755 so will not be described in any detail here. The improved anvil structure which constitutes the present invention and which is shown applied to this machine can be applied to practically any sort of stapling machine in place of the usual anvil structure.

As will be observed in the drawing, the stapling machine employed to illustrate one application of the invention includes a base IB, a casing II which is pivoted at its rear end to the rear end of the base in a position directly above the latter, and an operating handle I2. When the handle I2 is depressed the front end of the casing I I will move downwardly into engagement with the front end of the base l0 and a staple will be driven downwardly by a blade I3 and deformed into either a permanent staple I4, as shown in Fig. 5, or a temporary staple I5, as shown in Fig. 6, by the anvil structure I6 mounted on the front end of the base III.

The anvil structure I6 consists of a fixed section I'I and a shiftable section I8. The fixed section I'I contains an inwardly directed clinching groove I9, and the shiftable section I8 contains a similar inwardly directed clinching groove 20. The section I8 is shiftable longitudinally of the base from the position shown in Fig. 2 to the position shown in Fig. 3. When the section I8 is in the position shown in Fig. 2 the groove 25 is directly opposite the groove I9 and the two grooves will cooperate to deflect the legs 2l of the staple inwardly toward each other to produce the permanently clinched staple shown in Fig. 5. The section I8 is also provided with an outwardly directed bending groove 22, which groove lines up with the groove I9 when the section I8 is shifted into the position shown in Fig. 3. The groove 22 serves to bend one of the legs 23 of the staple in the same direction as the other leg, as shown in Fig. 6, thereby producing a temporary staple which can be easily withdrawn from the papers or other sheet material into which driven.

The shiftable section I8 of the anvil structui'e is guided in its longitudinal movement by a guideway 24 in the base and is held in position on the base by a rivet 25 which operates within an elongated slot 26. The length of the slot is such as to bring either the groove 20 or the groove 22 into exact transverse alignment with the groove I9 at the two extremes of movement. The section I8 is yieldingly retained in either position by means of a leaf spring 21 which is carried by the rivet 25 and engages with one or the other of two indexing ribs 28 and 29 on the underside of the base. The section I8 is provided at one end with a laterally projecting nger piece 30 by means of which the section can be easily shifted from one position to the other.

What is claimed is:

1. In a stapling machine, an anvil structure comprising a xed section and a shiftable sec-Y tion, the fixed section being provided with an tion, the xed section being provided with an inwardly directed bending groove for the reception of one leg of a staple and the shiftable section being provided with both an inwardly directed groove and an outwardly directed groove, said shiftable section being movable from a position in which one of its grooves is in alignment with the groove in the fixed section to a position in which the other of its grooves is in alignment with the groove in the xed section, and means for retaining the shiftable section in either of said positions.

3. In a stapling machine, an anvil structure comprising a fixed section and a shiftable section, the xed section being provided with an inwardly directed bending groove for the reception of one leg of a staple and the shiftable section being provided with both an inwardly directed groove and an outwardly directed groove, said shiftable section being movable from a position in which one of its grooves is in alignment with the groove in the xed section to a position in which the other of its grooves is in alignment with the groove in the xed section, and resiliently yieldable means for holding the shiftable section in either of said positions HELEN KRANTZ,

As Administratria: of the Estate of Edward Kraatz, Deceased. 

